An unsteady nonlinear and extended version of the Moore-Greitzer model is developed to facilitate the synthesis of a quasilinear stall vibration controller. The controller is synthesised in two steps. The first step defines the equilibrium point and ensures that the desired equilibrium point is stable. In the second step, the margin of stability at the equilibrium point is tuned or increased by...

In this paper, a set of mathematical model to be used for predicting the dynamics of a reciprocating compressor in a refrigerator has been developed. Based on the conservation of energy and mass, the model was established by dividing a global compressor into ten controlling volumes. The model was validated by the experimental results from literatures. It could be calculated for the transient ch...

This paper presents the results of performance testing of a single-stage centrifugal compressor operating under wet gas conditions. The test was performed at an oil and gas operator’s test facility and was executed at full-load and full-pressure conditions using a mixture of hydrocarbon gas and hydrocarbon condensate. The effect of liquid was investigated by changing the gas-volume fraction bet...

exergy analysis of a system is a method for recognizing the value and type of system availability against surrounding environment. it also helps to find how macroscopic properties of the system change during a process. this analysis is based on first and second laws of thermodynamics. by exergy analysis proportion of each process in the internal availability transmission and the places of usefu...

this paper deals with aerodynamic design of fan and compressor assembly for turbofan engines having arbitrary by-pass ratios. two different softwares were developed in this respect. first, based on general performance data at design point condition, a one-dimensional approach was activated. initial flow passages of both fan and compressor, together with splitter position were developed utilizin...

The scroll type of compressor is becoming popular and widely used in refrigeration and air conditioners. But it is time consuming to design and manufacture the compressor since its components are of complex shape and of high precision requirements. This paper presents a concurrent engineering approach to computer-aided design and manufacturing of the compressor. The authors use C‡‡ programming ...

The ability to identify novel patterns in observations is an essential aspect of intelligence. In a computational framework, the notion of a pattern can be formalized as a program that uses regularities in observations to store them in a compact form, called a compressor. The search for interesting patterns can then be stated as a search to better compress the history of observations. This pape...

In axial flow compressor, blade surface roughness is affected by many failure modes such as fouling, erosion, corrosion and foreign object damage. But with development of filter performance, particles with diameter larger than 2 μm cannot enter into compressor, so fouling is the most important influence factor which results in the variation of surface roughness. This study respectively discusse...

This study investigated the static and dynamic phenomena on R410A scroll compressor components by using finite element analysis (FEA) with ITRI self-developed scroll type compressor software (ITRI_STC software). The simulation results of the coefficient of performance, cooling capacity by tuning the design parameters integrated scroll geometric parameters with compressed discharge procedure and...

Due to the transcritical nature, some of the test methods used in the conventional subcritical refrigeration cycle, such as the liquid refrigerant flow metering method and the water-cooled condenser metering method, are no longer appropriate for evaluating the transcritical carbon dioxide (CO2) compressor performances. This paper introduces a performance test facility taken into account both th...